myleetcode

My LeetCode Solutions!

Contributing

Contributions are very welcome!

If you see an problem that you'd like to see fixed, the best way to make it happen is to help out by submitting a pull request implementing it. Refer to the CONTRIBUTING.md file for more details about the workflow.

You can also ask for problem solving ideas and discuss in GitHub issues directly.

INDEX

• Learn
  • Array and String
  • Queue & Stack
  • Linked List
  • Hash Table
  • Binary Search
  • Binary Tree
  • Binary Search Tree
  • N-ary Tree
  • Trie (Prefix Tree)
  • Decision Tree
  • Recursion I
  • Recursion II
  • Concurrency
  • Others
  • Shell
  • Database
  • Sort Algorithm
  • Search Algorithm
• Interview
  • Top Interview Questions
    • Easy Collection
    • Medium Collection
    • Hard Collection

Learn

Array and String

| # | Title | Solutions | Difficulty | Tag
|-----|----------------|:---------------:|:--------:|:-------------: |14|Longest Common Prefix|Java & Python|Easy| Introduction to String |26|Remove Duplicates from Sorted Array|Java & Python|Easy| Conclusion |27|Remove Element|Java & Go|Easy| Two-Pointer Technique |28|Implement strStr()|Java & Python|Easy| Introduction to String |54|Spiral Matrix|Java & Python|Medium| Introduction to 2D Array |66|Plus One|Java & Python|Easy| Introduction to Array |67|Add Binary|Java & Python|Easy| Introduction to String |118|Pascal's Triangle|Java & Python| Easy| Introduction to 2D Array |119|Pascal's Triangle II|Java & Python| Easy| Conclusion |151|Reverse Words in a String|Java & Python| Medium| Conclusion |167|Two Sum II - Input array is sorted|Java & Python| Easy| Two-Pointer Technique |189|Rotate Array|Java & Python| Easy| Conclusion |209|Minimum Size Subarray Sum|Java & Python| Medium| Two-Pointer Technique |283|Move Zeroes|Java & Python| Easy| Conclusion |344|Reverse String|Java & Python| Easy| Two-Pointer Technique |485|Max Consecutive Ones|Java & Python |Easy| Two-Pointer Technique |498|Diagonal Traverse|Java & Python |Medium| Introduction to 2D Array |557|Reverse Words in a String III|Java & Python |Easy| Conclusion |561|Array Partition I|Java & Python|Easy| Two-Pointer Technique |724|Find Pivot Index|Java & Python| Easy | Introduction to Array |747|Largest Number Greater Than Twice of Others|Java & Python| Easy| Introduction to Array

Queue & Stack

| # | Title | Solutions | Difficulty | Tag
|-----|----------------|:---------------:|:--------:|:-------------: |20|Valid Parentheses|Java & Python|Easy| Stack: Last-in-first-out Data Structure |133|Clone Graph|Java & Python|Medium| Stack and DFS |150|Evaluate Reverse Polish Notation|Java & Python|Medium| Stack: Last-in-first-out Data Structure |155|Min Stack|Java & Python|Easy| Stack: Last-in-first-out Data Structure |200|Number of Islands|Java & Python|Medium| Queue and BFS |225|[Implement Stack using Queues](https://leetcode.com/problems/implement-stack-